We found a computer bug in v3.25. In Pure Mode, when Carbon Filtration is chosen, the programming won't maintain pure, 96% abv. Instead, it will change its course to a normal pot distillation.
The quick fix it to not use the Carbon Filtration option, when distilling in Pure Mode.
Over here, we are ammending the problem. Timeline is that we expect this bug to be fixed today.
If you have Firmware Version 3.25 and use the Carbon Filtration option, please let us know, so we can ship you a new computer!
www.iStill.eu